F(x)=2(x2)-3x (-1≤x≤2)F(x)=-(x2)+4x+8 (-4≤x≤4)F(x)=1/1-x(1-x)F(x)=更号下-(x2)+2x+8F(x)=2-更号下4x-(x2)F(x)=x+更号下2x-3

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